AWARDING BRAINLIEST Suppose 100 radioactive atoms have a half-life of 10 seconds. Approximately how many radioactive atoms will be left after 20 seconds?

50
12.5
25
75

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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hi,

what occurs during a solar eclipse?

there are small tides across earth.

the moon is between earth and the sun.

p.s. im not sure if the first answer is correct because during a solar ecliphse there are spring tides and i dont know if they are the same.